m1a2st commented on code in PR #19622:
URL: https://github.com/apache/kafka/pull/19622#discussion_r2085006260


##########
clients/src/main/java/org/apache/kafka/common/security/oauthbearer/OAuthBearerLoginCallbackHandler.java:
##########
@@ -179,55 +180,45 @@ public class OAuthBearerLoginCallbackHandler implements 
AuthenticateCallbackHand
 
     private Map<String, Object> moduleOptions;
 
-    private AccessTokenRetriever accessTokenRetriever;
+    private JwtRetriever jwtRetriever;
 
-    private AccessTokenValidator accessTokenValidator;
-
-    private boolean isInitialized = false;
+    private JwtValidator jwtValidator;
 
     @Override
     public void configure(Map<String, ?> configs, String saslMechanism, 
List<AppConfigurationEntry> jaasConfigEntries) {
-        moduleOptions = JaasOptionsUtils.getOptions(saslMechanism, 
jaasConfigEntries);
-        AccessTokenRetriever accessTokenRetriever = 
AccessTokenRetrieverFactory.create(configs, saslMechanism, moduleOptions);
-        AccessTokenValidator accessTokenValidator = 
AccessTokenValidatorFactory.create(configs, saslMechanism);
-        init(accessTokenRetriever, accessTokenValidator);
+        Map<String, Object> moduleOptions = 
JaasOptionsUtils.getOptions(saslMechanism, jaasConfigEntries);
+        JwtRetriever jwtRetriever = new DefaultJwtRetriever(configs, 
saslMechanism, moduleOptions);
+        JwtValidator jwtValidator = new DefaultJwtValidator(configs, 
saslMechanism);
+        configure(moduleOptions, jwtRetriever, jwtValidator);
     }
 
-    public void init(AccessTokenRetriever accessTokenRetriever, 
AccessTokenValidator accessTokenValidator) {
-        this.accessTokenRetriever = accessTokenRetriever;
-        this.accessTokenValidator = accessTokenValidator;
+    void configure(Map<String, Object> moduleOptions, JwtRetriever 
jwtRetriever, JwtValidator jwtValidator) {
+        this.moduleOptions = moduleOptions;
+        this.jwtRetriever = jwtRetriever;
+        this.jwtValidator = jwtValidator;
 
         try {
-            this.accessTokenRetriever.init();
+            this.jwtRetriever.init();
         } catch (IOException e) {
-            throw new KafkaException("The OAuth login configuration 
encountered an error when initializing the AccessTokenRetriever", e);
+            throw new KafkaException("The OAuth login callback encountered an 
error when initializing the JwtRetriever", e);
         }
 
-        isInitialized = true;
-    }
-
-    /*
-     * Package-visible for testing.
-     */
-
-    AccessTokenRetriever getAccessTokenRetriever() {
-        return accessTokenRetriever;
+        try {
+            this.jwtValidator.init();
+        } catch (IOException e) {
+            throw new KafkaException("The OAuth login callback encountered an 
error when initializing the JwtValidator", e);
+        }
     }
 
     @Override
     public void close() {
-        if (accessTokenRetriever != null) {
-            try {
-                this.accessTokenRetriever.close();
-            } catch (IOException e) {
-                log.warn("The OAuth login configuration encountered an error 
when closing the AccessTokenRetriever", e);
-            }
-        }
+        Utils.closeQuietly(jwtRetriever, "The OAuth login callback encountered 
an error when closing the JwtRetriever");
+        Utils.closeQuietly(jwtValidator, "The OAuth login callback encountered 
an error when closing the JwtValidator");

Review Comment:
   `Utils.closeQuietly` uses a default error message template, so we should 
update the string to match that default format.
   
https://github.com/apache/kafka/blob/62bec20aefcdb94e8a66f5e3f74e40916981912a/clients/src/main/java/org/apache/kafka/common/utils/Utils.java#L1114



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